The tag "duarte" in the context of a porn video refers to a specific actor or actress with that name. It could be either an individual performer's stage name or their real name. This term is not a specific porn genre, action, or category like other tags you might encounter, such as "lesbian," "threesome," or "teen." Instead, it identifies a particular person involved in the content of the video.
In this case, "duarte" would be the same as seeing "Johnson" or "Williams" as performer tags. It's essentially an identifier for that specific individual in the porn industry.